Ubuntu codeblocks 编译出现 error:id returned 1 exit status?

#include<iostream>
#include<unistd.h>
#include<thread>
#include<mutex>
using namespace std;
void execute(mutex &m,char &i,char t)
{
    for(;true;m.lock(),cout<<"线程"<<t<<"执行中，输入:",cin>>i,cout<<"线程"<<t<<"执行",i==t?cout<<"成功":cout<<"失败",cout<<"。"<<endl,m.unlock(),sleep(1));
}
int main(int argc,char *argv[])
{
    mutex m;
    char i;
    thread t([&m,&i]()
    {
        execute(m,i,'t');
    }),u([&m,&i]()
    {
        execute(m,i,'u');
    }),v([&m,&i]()
    {
        execute(m,i,'v');
    });
    t.join();
    u.join();
    v.join();
    return 0;
}

https://blog.csdn.net/qq_39326472/article/details/95459107